I understand that you're suffering a lot, but look at some of these things you've mentioned. Really, many are quite positive:

Your illness isn't genetic. That means that it's possible to gain control over it. It isn't something you're forced to live with for your entire life.

You feel like you were cutting yourself for attention. Well that's a really important epiphany! Attention is a very human need, and you should never feel guilty about needing, wanting, and seeking it. Now that you realize why you were cutting yourself, you can seek attention in a way that isn't self-destructive.

As for school, yeah it sucks. And it's combined with all the pain of growing up. It's something you just have to get through with as little damage to your psyche as possible. Look for others who make being there feel good, and don't worry about normalcy. Worry about happiness.

All these things are easier said than done of course, but for what it's worth, I wish you luck, happiness, peace, and lots and lots of strength.